This article will delve into how to implement the Request / Response pattern under the asynchronous message delivery framework of MQTT, with the new features of MQTT 5.0.

Will Message is an important feature in MQTT, which solves the problem that only the server can know whether clients are offline. It allows us to gracefully take follow-up actions for unexpectedly offline clients.

Shared subscription is a new feature introduced by MQTT 5.0 protocol, which is equivalent to the load balancing function of subscribers.

In this article, we will introduce the session mechanism of MQTT protocol, as well as Clean Start and Session Expiry Interval, two connection parameters used to manage the session lifecycle.

In this article, we will focus on the Payload Format Indicator and Content Type properties of MQTT 5.0, exploring how they make the parsing of messages more transparent and efficient.

MQTT 5 is the latest version of the protocol, offering many improvements and new features over its predecessors.

MQTT Topic Alias allows users to reduce the possibly long and repeatedly used topic name to a 2-byte integer, so as to reduce the bandwidth consumption when publishing messages.

We will introduce in detail the specific use of the new features of MQTT X v1.7.0, especially how to use MQTT X to test features of MQTT 5.0.

User Properties are the user-defined properties that allow users to add their metadata to MQTT messages to expand more application scenarios.

MQTT 5.0 adds a new feature enhanced authentication, which includes query/response style authentication can implement bi-directional authentication of the client and broker.

MQTT 5.0 brings many new features, this article will give an introduction to the use of the new feature "flow control" in an easy-to-understand way.

EMQX MQTT 5.0 topic rewrite supports rewriting topic A to topic B, when subscribing topics, publishing messages and unsubscribing in MQTT client according to the rule configured by clients.